How the fuck am I supposed to beat this asshole...

yuh, lightning does nothing to you before you leave the air.

Maybe if you're in the swords hitbox it will do damage, but I've never deflected it in the air and as long as you don't jump too early you'll automatically catch it and can throw it back.

Fellas
What is the point of eel liver when lightning is either nullified or your bar goes to full and you die